Departamento de Ciências Fisiológicas, Instituto de Biologia, UFRuralRJ, Brazil.
J Invertebr Pathol. 2011 Feb;106(2):192-5. doi: 10.1016/j.jip.2010.09.006. Epub 2010 Sep 17.
The egg-laying rate, number of egg masses, number of eggs/mass, number of eggs hatched/snail and egg viability of Biomphalaria glabrata exposed to different doses (5 and 50) of Echinostoma paraensei miracidia were analyzed as indicators of reproductive activity. Polystyrene plates were placed in aquariums containing the snails and every other day for four weeks after infection the plates were removed to count the number of egg masses and eggs laid. After this, the plates were numbered individually and placed in new aquariums free of snails and the egg masses were observed daily to determine the hatching rate. On average there was an increase in the parameters evaluated in the infected snails in relation to the controls (uninfected snails), except for egg viability, which was significantly lower in the groups infected with 50 miracidia. These findings indicate that when infected, this host snail is able to increase its reproductive activity, suggesting an ecological strategy to maintain the species.
产卵率、产卵量、每卵质量、每螺孵出卵数和卵活力是评价繁殖活动的指标，研究了暴露于不同剂量（5 和 50）的后尾蚴的光滑萝卜螺的生殖活性。将聚苯乙烯板放在含有蜗牛的水族箱中，感染后每两周取出一次板，以计算产卵量和产卵数。之后，将板单独编号并放入新的无蜗牛的水族箱中，每天观察卵块以确定孵化率。平均而言，与对照组（未感染的蜗牛）相比，感染蜗牛的各项参数都有所增加，除了卵活力，感染 50 条尾蚴的组显著降低。这些发现表明，当被感染时，这种宿主蜗牛能够增加其生殖活性，这表明了一种维持物种的生态策略。
